LM3355MM-4.1

Voltage Regulators - DC DC Switching Regulators Overview

The LM3355MM-4.1 is a regulated buck-boost switched capacitor DC/DC converter manufactured by National Semiconductor, now part of Texas Instruments. This integrated circuit provides a positive fixed output voltage of 4.1V with a maximum output current capability of 50mA. It operates within an input voltage range that supports both step-down and step-up conversion modes, making it suitable for battery-powered applications where supply voltage may vary above or below the required load voltage. The device integrates synchronous rectification logic to improve efficiency compared to traditional diode-based solutions. It features a switching frequency of 1MHz, allowing for the use of small external capacitors. The component is housed in a compact 10-TFSOP (also known as 10-MSOP) package with a width of 3.00mm, designed for space-constrained printed circuit board layouts.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated buck-boost topology enables regulation from input voltages both higher and lower than the fixed output level
• Fixed 4.1V output eliminates the need for external feedback resistors for standard voltage requirements
• High 1MHz switching frequency permits the use of miniature external capacitors to reduce overall solution size
• Internal charge pump architecture provides efficient power conversion without requiring inductors

Voltage Regulators - DC DC Switching Regulators Applications

• Portable devices requiring stable voltage from single-cell lithium-ion batteries
• Sensor modules needing consistent power despite varying battery states
• Low-power embedded systems with strict space limitations
• Battery-operated medical instrumentation requiring precise voltage regulation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin carefully, as National Semiconductor assets were acquired by Texas Instruments. Ensure the specific suffix matches your design requirements, noting that some variants may differ in temperature range or packaging. Confirm RoHS compliance status if environmental regulations apply to your assembly process. Cross-reference the exact part number against official TI documentation to avoid confusion with similar LM335x family members that may have different current ratings or output voltages.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Choose this component when inductor-free solutions are preferred to minimize electromagnetic interference and physical footprint. It is appropriate for loads drawing up to 50mA where moderate efficiency is acceptable. Consider thermal performance in dense PCB layouts, as power dissipation depends on the input-output voltage differential. Evaluate whether the fixed 4.1V output meets system requirements without additional linear regulation stages.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM335x series of switched capacitor regulators, which offer inductorless voltage conversion. Unlike the LM3354, which provides 90mA output, the LM3355 is optimized for lower current applications at 50mA. The MM-4.1 designation indicates the specific output voltage and package type within the broader product line. These devices share common architectural features but differ in electrical specifications and thermal characteristics.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other LM3355 variants with different output voltages if the 4.1V requirement can be adjusted. For higher current needs, consider the LM3354 series. Verify pin compatibility and thermal resistance when replacing with components from other manufacturers offering similar switched capacitor topologies.